Barking-drum.



A, H. WHITE. I

BARKiNG DRUM.

APPLICATION FILED MAR. 26. I915- 1,3(L536 Y Patented Apr. 15, 1919.

. v 3 $HEETS-SHEET 1.

A. H. WHITE.

I BARKING DRUM.

APPLICATION FILED MAR. 26. 1915- Pafented Apr. 15, 1919 3 SHEETSSHEET 2.

1,3053&

A. H. WHITE.

BARKING DRUM. APPLICATION- FILED MAR. 26. 1915.

l ,3OO,536, Patented Apr. :15, 1919.

- 3 SHEETS-SHEET 3.

000 ooococu W AEBRQSE H. WHITE, OF BROOKLYN, NEW YORK, ASSIGNOR 'IO INTERNATIONAL PAPER CGMPANY, A CORPORATION OF NEW YORK.

BARKING-DRUM.

' Specificationof Letters Patent.

Application filed March 26, 1915. Serial No. 17,084.

To all whom it may concern Be it known that I, AMBROSE H. WHITE, a citizen of the United States, residin at Brooklyn, in the county of Kings and tate of New York, have invented certain new and useful Improvements in Barking Drums, of which the following is a speci cation, reference being had therein to the accompanying drawing,

This invention relates to means for the treatment of wood, in the conversion of the same into pulp for use in the manufacture of paper, and it has reference more particularly to that stage of the operation in which the bark is removed from the wood. For this purpose it is the common practice to employ a rotary drum known as a barking drum, in which chunks of wood are placed, the impact of the chunks against each other and their attrition, due to the rotary motion of the drum, acting to loosen and detach the bark, which escapes through openings in the drum, while the bark-freed wood is discharged separately therefrom. Further, it is the common practice to partially submerge the drum in a tank of water so that the water will be mingled with the wood in the drum, and facilitate the barkin operation.

My invention consists of various improvements in devicesof this character, which improvements are directed more particularly to the form and construction of the drum; tothe means for supplying the wood and water to the drum to the end that the operation may be continuous and without interruption; to the manner of controlling the discharge of the'bark-freed wood therefrom; and to various other features of construction, which will be pointed out in the specification.

In the accompanying drawings I have illustrated my invention in one form by way of example but it will be manifest that the same may be variously changed and modified by the skilled mechanic without departing from the spirit of the invention; and further it will be'understood that the invention is not limited to any particular form or construction ofthe parts except in so far as such limitations are specified in the claim.

In the accompanying drawings:

Figure 1 is a top plan view of a barking drum having my invention embodied therein.

Fig. 2 is a vertical longitudinal sectional elevation on the line a-a.

Fig. 3 is a transverse sectional elevation on the line b-b of Fig. 1.

Fig. 4 is an elevation of the receiving end of the drum on an enlarged scale.

Fig. 5 is an elevation of the discharge end of the drum on an enlarged scale.

Fig. 6 is a longitudinal central ,section through the drum showing the retarding members therein.

Fig. 7 is a fragmentary sectional elevatlon through the receiving end of the drum and the adjacent wall of the tank showing the water-tight joint between the two.

Fig. 8 is a sectional elevation on the line cc of Fig. 3, showing the water-ti ht joint between the tank wall and the discharge end of the drum.

Referring to the drawings:

1 represents a horizontal rotary cylindrical drum open at two, ends so that the wood to be barked may be introduced into its receiving end and delivered from its discharge end. This drum which may be of any suitable and appropriate material, is in the present instance imperforate for the main portion of its length, while for the remainder of its length adjacent its .discharge end it is provided with circumferentially extending slots 1 through which the bark, detached from the wood, escapes in a lateral direction. 2 represents a tank for containing water for circulation through the lower portion of the drum. This tank is formed with two lateral branches 2* and 3 and a longitudinally extending connecting portion 4. The drum extends alongside of the longitudinal portion of the tank with its receiving end in position to communicate with the lateral branch 2 and with its discharge end in position to communicate with the lateral branch 3. a vertical paddle wheel 5 being mounted for rotation 1n the longitudinal portion of the tank to produce a circulation of the water through the drum and tank.

The drum is so supported that it may be rotated about its longitudinal central axis. In the present instance the su ports 301R" prise two pairs of supporting ro is 6, mount dation 7 at the side of the longitudinal portion of the tank. The drum is encircled by tires 8 which rest on the supporting rolls, whereby the drum is free to be rotated about a horizontal longitudinal axis. By thus supporting the drum at the side of and beyond the longitudinal portion of the tank, the water is prevented from reaching the bearings of the supporting rolls and the ad jacent parts, and therefore there will be no liability or danger of rust or corrosion of the parts.

Rotary motion maybe imparted to the drum in any well known and appropriate manner, and from any suitable source of power. In the present instance I employ an electric motor 9, sustained by a platform 10 extending over the ion itudinal portion of the tank, which motor is belted to a pulley 11 carried by a shaft 12 ournaled in bearings on the platform 10. The shaft has fixed to it a pinion l3 meshing with a gear 14 on a counter shaft 15 mounted in bearings on the platform, which shaft 15 has fixed to it a inion 16 meshing with a gear ring 17 fixed to and encircling the drum. By this system of gearing, the motor is speeded down so as to impart to the drum a comparatively slow rotary motion.

At the receiving end of the drumv is an upright frame work 18, having fixed to its inner side a vertical plate 19 which extends across the open end of the drum and is provided in its lower portion with perforations or holes 20, as shown in Fig. 4. Those holes are in such position that water may fiow therethrough and into the drum from the lateral branch 2 of the tank, the latter being formed with a mouth 21 which is seated around the perforated portion of the plate 19 so that the water from the branch of the tank will flow through the mouth and the perforations in the plate, and will enter the lower portion of the drum as the latter is rotated with its receivin end in proximity to the plate.

he mouth of the tank is formed. with a curved shoulder 22, and the end of the drum is formed with an annular shoulder 23, which shoulders are arranged adjacent each other and in axial alinement, a fixed packing strip 24 being sustained by the and bearing against the said shoulders so as to form a water tight joint between them as shown in Fig. 7. In the rotation of the drum, the annular shoulder 23 moves in close frictional contact with the packing strip and the latter effectually prevents the escape of the water from :between the mouth 21 and the end of the drum, so that the water cannot reach the supporting rolls 6 on which'the' drum is rotatably sustained,

and the adjacent parts. a

The lateral branch 3 of the tank is bounded by an outer wall 25 and an inner wall frame work,

.against the external surfaces of said shoulders so as to form a water-tight joint, as shown clearly in Fig. 8. Inthe rotation of the drum, the annular shoulder 27' thereon moves in close frictional contact with the packing strip and the latter seats closely against the external surface of the shoulder 2 a so that the joint thus formed will prevent such water as may find its way over the curved edge of the tank from reaching the tank-supporting rolls '6.

From the construction described, it will be noted that the tank being supplied'with water up to the level indicated in Figs. 2 and 3, it will flow into and, occupy a like level in the drum the efiect being to submerge the lower portion of the drum without the objectionable condition which has with the rotary supports for the drum, in

the present instance the journals of the supporting rolls 6 and adjacent parts.

The paddle wheel 5, before alluded to, is rotated in such direction (as indicated by the arrow in Fig. 2), that a circulation of the water will be producedin the tank toward the receiving end of the drum and in thedrum in a. direction from the receiving to the discharge end. .The paddle wheel may be driven in any suitable and appropriate manner, in the present instance it being provided with a pulley. 29 belted to a pulley 30 on a' horizontal transverse shaft 31 extending direction of the arrow in Fig. 4, the mass.

of wood will be agitated and carried around in the drum, being lifted by the drum at the up-going side .of the same, and falling at the down-going side of the drum. In this operation the bark will be detached from the wood, and .the contents of the drum will the bark escaping laterally through the slots near the end of the drum while the barkfreed wood is delivered from the end of the drum, the wood and bark entering the lattransversely and mounted in bearings on the i gradually advance toward its discharge end,

eral branch 3 action a constant 1s maintained in the ruption. For this purpose there is employed the form of a trough a supply conveyor in ill leading upwardl Y to a point above the frame 18. Arranged in the bottom of the trough is an endless conveyer chain 3% provided with suitable cleats or, lugs to engage the chunks of wood, the upper end of the chain passing around a sprocket \vheel mounted in suitable bearings sustained in the frame 18. This conveyer delivers into a transversely extending trough 36 sustained above the frame 18 and inclined at its bottom so as to deliver into a feed hopper 3?. The feed hopper 37 is mounted fixedly in the frame 18 and has its inner delivery end in position to discharge into the drum at the down-going side of the same, the hopper being so inclined from the vertical that the wood will enter the drum in the general direction of the movement of the mass of wood therein; whereby there will be no danger of the chunks becoming clogged at the delivery end of the hopper. This feeding hopper is of general rectangular form in cross section, its delivery end being seated in an opening in the vertical plate 19, and the wood delivered to the trough 36 by the supply conveyer, will be directed by said trough into the hopper and from the hopper will enter the down-going side of the drum in a direction inclined forwardly and transversely.

The bark escaping through the slotted end of the drum will accumulate on the tank bottom, and in order that it may be prevented from accumulating in such quanti ties as to interfere with the. operation of the drum and in order that the bark. may be recovered for use. means are provided for continuously removing the bark from the tank and discharging the same therefrom This operation is edected as shown more particularly in Fig. 3, where it will be seen that an endless conveyor device is arranged to scrape over the bottom of the tank and positively remove and deliver the bark therefrom. This scraper device consists of two parallel endless chains 38 connected at intervals by transverse scraper blades 39, which chains pass over upper guiding sprocket wheels 40, lower sprocket wheels ll and an intermediate side sprocket wheel 42, the said sprocket wheels being so disposed that the chain will surround the slotted end of the drum at a distance therefrom and will travel at its lower stretch transversely along the bottom of screen X inclined upwardly therefrom; In the operation of the conveyer, the blades will act to scrape the bark from the bottom of the tank upwardly over the inclined screen, thus allowing the water to drain therefrom, and the drained bark will be delivered over the side of the tank. The upper guide sprocket wheels are journaled in an upright frame structure 43 at the discharge end of the drum. The lower sprockets are mounted in suitable bearings at the bottom of the lateral branch of the tank, while the side sprocket is mounted in bearings on the platform 10. The conveyor device is operated continuously in any suitable manner and from any suitable source of power.

I propose to vary the point of the discharge of the barlnfreed wood from the drum, in order that the wood being barked may remain in the drum a greater or less period of time according to the conditions encountered in practice. For certain kinds of wood, a greater period of time is required for the removal of the bark, while with other kinds of wood speedily. By raising or lowering the discharge opening, the passage of the wood considered individually as logs or chunks through the drum may be correspondingly retarded or hastened. in the present instance, T effect this object by providing as shown in Fig. 5 a cover plate 45 fixed to the frame structure 43 so that the plate will lie close to the open end of the drum. A vertical opening a6 is formed in the plate 45, the sides of which opening are provided with guideways a7 in which is mounted to move up and down, a slide 48 containing a semicircular opening 49 for the discharge of the wood, a downwardly inclined spout 50 being fixed at its upper edge to the bottom of said opening. To the upper end of the slide. chains 51 are attached, which chains pass over guide pulleys 52 and 53 sustained by the frame structure 43 and downwardly at the outer side of the frame, weights 54: being attached to the ends of the chains so as to counter-balance the slide. As a result of this construction, the slide 48 is adapted to be moved vertically in its guide ways and may be positioned at differ ent points in the vertical height of the drum so as to correspondingly vary the position of the discharge opening in a vertical direction, and in this manner control the period of time the individual logsor chunks will remain in the drum subject to the barking operation. v v

The spout 50 discharges onto an inclined plate 60 sustained by the frame work 43, which directs the wood against a deflector the bark is freed more,

the tank and laterally over a plate 61, which in turn deflects it inwardly and downwardly into the tank. As the wood enters the tank, it may be directed, by

,a workman with the aid of a pole standing on a platform 10 onto a conveying device 62 extending down into the water, by which conveying device it is carried away.

In order that the chunks of wood which are not completely freed of the bark may be returned to the drum for further operation, I provide a return conveyer 63 consisting of an endless chain with conveyer cleats or lugs fixed thereto at intervals and traveling in the bottom of a trough 64 leading upwardly from the end of the branch 3* of the tank to the trough 36, into which the conveyer discharges, the wood delivered to the trough being directed by the latter into the feed hopper 37. The chain travels over a lower sprocket wheel 65 suitably mounted at the side of the drum near its discharge end and over an upper sprocket wheel 66 sustained by the frame work 18 adjacent the receiving end of the drum, the said chain being driven continuously in any suitable manner and from any suitable source of power. Such chunks of wood as are not entirely freed of the bark may be directed by the worlnnan on the platform 10, by means of a pole, onto said conveyer chain of the conveyer 63.

In order that the wood may be retarded in its passage through the drum, I propose to provide the same on its interior with .a series of retarding devices in the form of transverse partitions A, arranged at intervals throughout the length of the drum, and provided with central openings of gradually decreasing diameters toward the discharge end of the drum to permit the wood to pass therethrough, these partitions with the openings forming in effect inwardly extending annular ribs which will cause the mass of wood in its passage through the drum to approach the transverse center of the same.

In the operation of the mechanism, the various operative parts being set in motion, the wood is fed continuously into the receiving end of the drum, while the water is circulated continuously through the drum and tank. The chunks of wood in the drum being tumbled over into contact with each other will, by their impact and attrition, detach the bark, which will escape through the slots in the end ofthe drum, while the barkfreed wood will be delivered through the discharge opening, and the wood and bark will enter the lateral branch 3 of the tank, the bark being continuously removed and strained of its water and delivered over the side of the tank, while the wood will be carried away by the conveyer 62, Such wood as may not be thoroughly freed of thebark may be returned for further operation by the return conveyer 63.

It is seen, therefore, that the operation of the mechanism is continuous and uninterrupted, the wood being continuously fed to the drum, the water being continuously circulated therethrough, the bark and wood being continuously discharged from the drum, and the bark being continuously removed from the tank. a

I believe myself to be the first, in a barking apparatus including a horizontal rotary barking drum, to feed the wood to be barked continuously into the receiving end of the drum and discharge the same continuously from the discharge end, and at the same time set up a flow of water axially through the drum from its receiving to its discharge end, while maintaining a substantial level of water in the drum, and I lay broad claim herein to this construction, but make no claim to the return of the water flowing from the discharge end of the drum to its receiving end, such returnpf the water in order to create a continuous circulation, being claimed in an application of Edward Hutchins. filed March 26th, 1915, Ser. No.

Having thus described my invention, what of water and flowing the same continuously throughthe drum from its receiving end to its discharge end to cause the wood to be continuously discharged from the discharge end of the drum.

Intestimony whereof, I have affixed my signature.

A ROSE H. WHITE. 

